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Title: Thermal evolution of quasi-one-dimensional spin correlations within the anisotropic triangular lattice of α - NaMnO 2

Journal Article · · Physical Review B
 [1];  [2];  [2]; ORCiD logo [3];  [2];  [1]
  1. Univ. of California, Santa Barbara, CA (United States). Materials Dept.
  2. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Center for Neutron Research
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division

Magnetic order on the spatially anisotropic triangular lattice of α-NaMnO2 is studied via neutron diffraction measurements. The transition into a commensurate, collinear antiferromagnetic ground state with k=(0.5,0.5,0) was found to occur below TN=22 K. Above this temperature, the transition is preceded by the formation of a coexisting, short-range ordered, incommensurate state below TIC=45 K whose two-dimensional propagation vector evolves toward k=(0.5,0.5) as the temperature approaches TN. At high temperatures (T>TIC), quasielastic scattering reveals one-dimensional spin correlations along the nearest-neighbor Mn-Mn “chain direction” of the MnO6 planes. Here, our data are consistent with the predictions of a mean-field model of Ising-like spins on an anisotropic triangular lattice, as well as the predominantly one-dimensional Heisenberg spin Hamiltonian reported for this material.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of California, Santa Barbara, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725; SC0017752
OSTI ID:
1493129
Alternate ID(s):
OSTI ID: 1480154; OSTI ID: 1594781
Journal Information:
Physical Review B, Vol. 98, Issue 14; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 8 works
Citation information provided by
Web of Science

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Cited By (2)

Cluster glass behavior of the frustrated birnessites A x Mn O 2 · y H 2 O ( A = Na , K ) journal December 2019
Nanoscale degeneracy lifting in a geometrically frustrated antiferromagnet text January 2020

Figures / Tables (12)


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